As record-breaking heat continues, many people are feeling unusually drowsy and lethargic. While heat itself does not directly induce sleep, the physical strain from regulating body temperature, dehydration, and sleep deprivation caused by tropical nights can significantly increase daytime fatigue and drowsiness.
According to the Korea Meteorological Administration, the maximum daytime temperatures across the country are expected to range from 31 to 39 degrees Celsius, with similar highs forecasted for August 6 and 7. The agency warns that heat waves and tropical nights will persist in most regions, urging the public to take special care of their health.
This year's heat has reached unprecedented levels. On August 2, the temperature in Yangsan, South Gyeongsang Province, soared to 42.5 degrees Celsius, marking the highest temperature recorded in South Korea's meteorological history. The Korea Meteorological Administration attributes this unusual heat to a combination of high atmospheric pressure, strong sunlight, dry soil, and basin topography.
The first reason for increased drowsiness and lethargy in hot weather is the strain on the body during temperature regulation. As temperatures rise, the body increases blood flow to the skin and sweats to release heat. Prolonged exposure to this process can lead to quicker fatigue and both physical and mental exhaustion.
In particular, failing to drink enough water while losing fluids and electrolytes through sweat can exacerbate fatigue and reduce concentration. Research indicates that when high temperatures and dehydration occur together, they can affect blood flow and oxygen delivery to the brain, increasing feelings of fatigue and impairing cognitive function. This drowsiness may not be a genuine desire for sleep but rather a result of decreased alertness and concentration due to the heat.
The second reason is the poor quality of sleep caused by tropical nights. The human body prepares for sleep by lowering its core temperature. However, if indoor and outdoor temperatures remain high at night, it becomes difficult to lower body temperature sufficiently, leading to trouble falling asleep and frequent awakenings, preventing deep sleep.
Prolonged exposure to high temperatures can result in symptoms such as headaches, dizziness, muscle cramps, fatigue, and decreased consciousness. In cases of heat exhaustion, excessive sweating can lead to extreme weakness, fatigue, paleness, nausea, and dizziness.
If you experience significant lethargy accompanied by headaches, dizziness, nausea, severe thirst, and cold sweats, it is advisable not to dismiss it as mere daytime drowsiness. Move to a cool location, loosen your clothing, and rest while drinking water.
If you are unable to respond properly when called, speak incoherently, or lose your sense of direction, you may be experiencing heat stroke. Heat stroke is a medical emergency that occurs when body temperature exceeds 40 degrees Celsius and is accompanied by central nervous system abnormalities, requiring immediate treatment. In such cases, do not hesitate to call emergency services.
To reduce fatigue and drowsiness caused by the heat, it is advisable to drink water regularly, even before feeling thirsty. During the hottest parts of the day, limit outdoor activities and intense exercise, and take regular breaks in cool areas. At night, use air conditioning or fans to lower bedroom temperatures, but avoid prolonged direct exposure to cold air.
The Korea Disease Control and Prevention Agency also recommends drinking water regularly, regardless of thirst, during heat waves and advises against outdoor work and exercise during the hottest hours. On suddenly hot days, it is important to adjust activity levels according to your physical condition rather than maintaining the usual intensity.
* This article has been translated by AI.
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